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ELECTRICAL MACHINES

Electrical Machines
Dummy coils are used for

 reducing armature reaction.
 mechanical balancing.
All of these
 increasing efficiency.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I and P
 V/2, I/2 and P/4
 V, I/2 and P/2
 V/2, I and P/2

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and low
 low and low
 high and high
 low and high

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 large and thin
 less and thick
 less and thin
 large and thick

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 large and thick
 large and thin
 less and thin
 less and thick

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